DRAW

The QUICK SETUP/DRAW GUI leads the user through the setup procedure for draw simulations. A typical DRAW GUI consists of DRAW TYPE, TOOL DEFINITION (BLANK, BINDER, LOWER TOOL and DRAW BEAD), BLANK PARAMETERS, and TOOL CONTROL, as shown in Figure 8.1.7.

Figure 8.1.7  A typical draw die GUI for single action draw operation

 

DRAW TYPE

Enable the user to select one of the four standard draw operations provided in the QS GUI. In addition, the user may select either lower or upper tool in the setup depending on the type of tool surfaces (top or bottom).

 

TOOL DEFINITION GUI

Define the tool, blank and drawbead for draw simulation.

 

BLANK PARAMETERS

Define blank material and properties. 

 

TOOL CONTROL

Enable the user to define the motion of the tool.

 

 

ADVANCED

Allow the user to edit some of the default QS settings.

 

8.1.2.1       TOOL DEFINITION GUI

The tool definition GUI allows the user to assign the tooling and blank mesh required for setting up a particular draw simulation.

 

8.1.2.2       TOOL CONTROL

As shown in Figure 8.1.8, the tool control interface is utilized to set primary travel velocity and binder force. The user may activate the binder force control selecting the BINDER FORCE check box.

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Figure 8.1.8  The Tool Control interface

Depending on the draw type, the tool velocity and force are applied according to the following control scheme:

 

CRASH FORM                                                         Upper tool with defined tool velocity.

 

INVERTED DRAW (SINGLE ACTION)           Upper tool is controlled by velocity.

                                                                                                     Binder is controlled by either velocity or force.

 

TOGGLE DRAW (DOUBLE ACTION)             Upper tool is controlled by velocity.

                                                                                                     Binder is controlled by velocity or force.

 

FOUR PIECE DRAW                                             Upper tool is controlled by velocity.

                                                                                                     Upper binder is controlled by velocity or force.

                                                                                                     Lower binder is controlled by velocity or force.

 

If the default unit is selected, the unit of velocity and force are in mm/s and Newton, respectively.

 

NOTE:

 

1.   In the QS setup, all force controls are implemented after the binder is closed using velocity control. That is, the velocity control is switched to force after binder closing.

2.   In the QS setup, the force applied to the lower binder (in FOUR-PIECE DRAW) is controlled by velocity or force with rigid body control.  Rigid body control will prevent the lower binder from moving up before the upper and lower binders clamp the blank.

 

For example (TOGGLE DRAW):

If the user needs to control the punch with velocity and the binder with force control:

a.       Provide punch travel velocity (default is 5000 mm/s).

b.       Provide binder velocity (default is 2000 mm/s).

c.        Provide binder force (default is 200,000 Newton).

 

8.1.2.3       ADVANCED

This feature allows the user to edit the default QUICK SETUP settings, including the die gap, load curve, output frames and drawbead control. The dialog box is shown in Figure 8.1.9.

quicksetupadvanced

Figure 8.1.9  Quick Setup Setting dialog box

 

The GAP CONTROL allows the user to set the tooling gap and clearance between the tooling and blank. The user can select either an absolute or percentage value. The default setting for die gap and clearance is 10% (110% of blank thickness) and 50% (50% of blank thickness).  For example, if the blank thickness is 1.00 mm, the tooling gap and clearance is 1.10 mm and 0.50 mm, respectively.

 

The load curve setting enables the user to define the slopes of the velocity load curve and lower binder travel limitation of four-piece draw simulation.

 

The user may define the output frames of each stage. The default settings for wrap and stretch frames are 5 and 5. For punch stage, the user can define the total amount of output frames, or output some special frames. The figure indicates the distance between tool and end position. According to requirements, the user can freely edit these values which are separated by commas. The default method for punch stage is output special frames.

 

8.1.2.4       The QUICKSETUP/DRAW PROCEDURE

 

The following is the procedure for setting up a draw simulation using QS/DRAW:

 

1.       Select draw type and tooling options.

2.       Define tooling.  Refer to Section 8.1.1.1.

3.       Define blank parameters.  Refer to Section 8.1.1.2.

4.       Define tool motion.  Refer to Section 8.1.2.2.

5.       Define drawbeads.  Refer to Section 8.1.2.1.

6.       Set symmetry condition. The user can define symmetry boundary conditions by clicking on CONSTRAINT.  Refer to Section 5.6.2 for detailed information.

7.      Click APPLY and SUBMIT JOB buttons. After clicking APPLY, eta/DYNAFORM will create the matching tool, automatically adjust tooling position, generate travel curves and offset the contact interface. The SUBMIT JOB button allows the user to run the simulation via the ANALYSIS dialog box (refer to Section 15.1).